"Just because I was born in Mogadishu does not mean that I am a terrorist," he said.

"I did not get tortured. The officers they were just doing their jobs, you know, that's what they were doing," said Warfaa, adding "I'm really happy that I am free, you know, and actually finally justice has been served."

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Warfaa was arrested near Kenya's border with Somalia for allegedly possessing two passports with different names.

He was detained earlier this week with 10 other people in a sweep on suspected extremists near the Dadaab refugee camp, which houses at least 200,000 Somali refugees.

The crackdown followed an attack in January on a hotel complex in Nairobi in which 21 people were killed. The hotel assault was claimed by al-Shabab, Somalia's Islamic extremists who are linked to al-Qaida. The arrests were not directly linked to that attack.

Since 2011 Kenya has experienced several attacks by al-Shabab. The extremist group has vowed retribution on Kenya for sending troops to battle them in Somalia. Kenya is part of an African Union mission bolstering Somalia's fragile government from al-Shabab's insurgency.